MCQ
$sec^2(tan^{-1}2) + cosec^2(cot^{-1}3)=.........$
- ✓$15$
- B$6$
- C$13$
- D$25$
$sec^2 (tan^{-1}2) + cosec^2 (cos^{-1} 3)$
$= 1 + [tan (tan^{-1}2)]^2 + 1 + [cot (cot^{-1}3)]^2$
$= 1 + 4 + 1 + 9$
$= 15$
અથવા
$tan^{-1}2 = \alpha$ અને $cot^{-1}3 = \beta$ લઇ ને પણ કરી શકાય.
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